Almost all ATX motherboards use CR2032, but the battery is very easy to remove. Turn off the PC, move it away from a carpeted area and ground yoursef (touch the faucet in a sink), remove the side panel, take the battery out, look at it, take it to your local department store watch or electronics department and buy a new one.

... an HP employee expressing his own opinion.Please post rather than send me a Message. It's good for the community and I might not be able to get back quickly. - Thank you.